《2025年口算训练六年级数学上册人教版双色升级版》

$3.14×7= $
$3.14×2= $
$3.14×100= $
$3.14×30= $
$3.14×5= $
$3.14×10= $
$3.14×4= $
$3.14×6= $
$3.14×20= $
$3.14×8= $
$3.14×200= $
$3.14×40= $
$3.14×3= $
$3.14×300= $
$3.14×50= $
$3.14×0.1= $
$3.14×60= $
$3.14×9= $
$3.14×70= $
$3.14×80= $
$3.14×0.9= $

答案： 解析：这些题目都是基础的乘法口算题，主要考查对乘法运算的熟练度，特别是与$3.14$相关的乘法，这些题目通常出现在圆的周长和面积计算中。只需要直接计算即可。
答案：
$3.14 × 7 = 21.98$
$3.14 × 2 = 6.28$
$3.14 × 100 = 314$
$3.14 × 30 = 94.2$
$3.14 × 5 = 15.7$
$3.14 × 10 = 31.4$
$3.14 × 4 = 12.56$
$3.14 × 6 = 18.84$
$3.14 × 20 = 62.8$
$3.14 × 8 = 25.12$
$3.14 × 200 = 628$
$3.14 × 40 = 125.6$
$3.14 × 3 = 9.42$
$3.14 × 300 = 942$
$3.14 × 50 = 157$
$3.14 × 0.1 = 0.314$
$3.14 × 60 = 188.4$
$3.14 × 9 = 28.26$
$3.14 × 70 = 219.8$
$3.14 × 80 = 251.2$
$3.14 × 0.9 = 2.826$

$5÷\frac {2}{3}=$$\frac{15}{2}$
$60÷\frac {3}{4}=$80
$3.2×\frac {5}{8}=$2
$80÷\frac {2}{3}=$120
$\frac {6}{7}×21=$18
$\frac {6}{7}÷\frac {6}{5}=$$\frac{5}{7}$
$9÷\frac {3}{7}=$21
$81÷\frac {3}{5}=$135
$\frac {11}{13}×\frac {26}{33}=$$\frac{2}{3}$
$4÷\frac {1}{3}=$12
$\frac {5}{21}÷\frac {5}{7}=$$\frac{1}{3}$
$8÷\frac {4}{9}=$18
$\frac {7}{32}÷\frac {7}{16}=$$\frac{1}{2}$

答案： 解析：这些题目都是基础的数学运算题目，主要考查分数的乘法和除法运算。
答案：
$5 ÷ \frac{2}{3} = 5 × \frac{3}{2} = \frac{15}{2}$
$60 ÷ \frac{3}{4} = 60 × \frac{4}{3} = 80$
$3.2 × \frac{5}{8} = \frac{16}{5} × \frac{5}{8} = 2$
$80 ÷ \frac{2}{3} = 80 × \frac{3}{2} = 120$
$\frac{6}{7} × 21 = 18$
$\frac{6}{7} ÷ \frac{6}{5} = \frac{6}{7} × \frac{5}{6} = \frac{5}{7}$
$9 ÷ \frac{3}{7} = 9 × \frac{7}{3} = 21$
$81 ÷ \frac{3}{5} = 81 × \frac{5}{3} = 135$
$\frac{11}{13} × \frac{26}{33} = \frac{2}{3}$
$4 ÷ \frac{1}{3} = 4 × 3 = 12$
$\frac{5}{21} ÷ \frac{5}{7} = \frac{5}{21} × \frac{7}{5} = \frac{1}{3}$
$8 ÷ \frac{4}{9} = 8 × \frac{9}{4} = 18$
$\frac{7}{32} ÷ \frac{7}{16} = \frac{7}{32} × \frac{16}{7} = \frac{1}{2}$

$\frac {1}{2}×\frac {2}{3}×\frac {3}{4}=$$\frac{1}{4}$
$4×\frac {1}{3}×\frac {1}{4}=$$\frac{1}{3}$
$\frac {3}{8}×\frac {5}{9}×\frac {3}{5}=$$\frac{1}{8}$
$\frac {15}{2}×\frac {2}{3}×\frac {3}{5}=$3
$\frac {1}{2}×\frac {1}{3}×\frac {2}{5}=$$\frac{1}{15}$
$\frac {5}{6}×\frac {1}{15}×\frac {3}{4}=$$\frac{1}{24}$
$\frac {3}{4}×\frac {2}{7}×\frac {7}{12}=$$\frac{1}{8}$
$\frac {1}{2}×\frac {21}{11}×\frac {4}{7}=$$\frac{6}{11}$
$\frac {2}{5}×25×\frac {6}{7}=$$\frac{60}{7}$
$\frac {3}{5}×\frac {5}{9}×\frac {5}{8}=$$\frac{5}{24}$
$\frac {7}{12}×\frac {4}{7}×\frac {3}{4}=$$\frac{1}{4}$
$\frac {3}{7}×\frac {8}{9}×\frac {7}{16}=$$\frac{1}{6}$

答案： $\frac{1}{2}×\frac{2}{3}×\frac{3}{4}=\frac{1×2×3}{2×3×4}=\frac{1}{4}$
$4×\frac{1}{3}×\frac{1}{4}=4×\frac{1}{4}×\frac{1}{3}=1×\frac{1}{3}=\frac{1}{3}$
$\frac{3}{8}×\frac{5}{9}×\frac{3}{5}=\frac{3×5×3}{8×9×5}=\frac{3}{24}=\frac{1}{8}$
$\frac{15}{2}×\frac{2}{3}×\frac{3}{5}=\frac{15×2×3}{2×3×5}=3$
$\frac{1}{2}×\frac{1}{3}×\frac{2}{5}=\frac{1×1×2}{2×3×5}=\frac{1}{15}$
$\frac{5}{6}×\frac{1}{15}×\frac{3}{4}=\frac{5×1×3}{6×15×4}=\frac{15}{360}=\frac{1}{24}$
$\frac{3}{4}×\frac{2}{7}×\frac{7}{12}=\frac{3×2×7}{4×7×12}=\frac{6}{48}=\frac{1}{8}$
$\frac{1}{2}×\frac{21}{11}×\frac{4}{7}=\frac{1×21×4}{2×11×7}=\frac{84}{154}=\frac{6}{11}$
$\frac{2}{5}×25×\frac{6}{7}=10×\frac{6}{7}=\frac{60}{7}$
$\frac{3}{5}×\frac{5}{9}×\frac{5}{8}=\frac{3×5×5}{5×9×8}=\frac{15}{72}=\frac{5}{24}$
$\frac{7}{12}×\frac{4}{7}×\frac{3}{4}=\frac{7×4×3}{12×7×4}=\frac{3}{12}=\frac{1}{4}$
$\frac{3}{7}×\frac{8}{9}×\frac{7}{16}=\frac{3×8×7}{7×9×16}=\frac{24}{144}=\frac{1}{6}$
$\frac{4}{15}×30×\frac{1}{8}=8×\frac{1}{8}=1$